CN212366017U

CN212366017U - Rechargeable button cell

Info

Publication number: CN212366017U
Application number: CN202020583431.6U
Authority: CN
Inventors: 常海涛; 张志明; 叶永锋
Original assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Current assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-01-15
Anticipated expiration: 2030-04-17

Abstract

The utility model discloses a chargeable button cell, it includes: negative pole lid, positive pole shell, sealing washer, lasso, circlip and electric core. An accommodating cavity is formed between the positive electrode shell and the negative electrode cover; the sealing ring is arranged between the negative electrode cover and the positive electrode shell; the ferrule is arranged in the accommodating cavity and positioned between the sealing ring and the bottom wall of the anode; the elastic retainer ring is positioned in the negative cover; the battery cell is arranged in the accommodating cavity and comprises a negative pole lug and a positive pole lug; the negative pole tab extends outwards from the top end of the battery cell to the axial outer side of the elastic check ring along the radial direction of the battery cell and is welded with the elastic check ring; the positive pole lug extends to the bottom of the ferrule from the bottom end of the battery cell along the radial direction of the battery cell and is welded with the bottom. According to the utility model discloses a chargeable button cell through setting up circlip and lasso, makes the negative pole utmost point ear and the anodal utmost point ear of electric core and the electricity of negative pole lid and positive shell be connected more effectively, can guarantee the intensity of positive shell and negative pole lid, improves chargeable button cell's production efficiency.

Description

Rechargeable button cell

Technical Field

The utility model relates to a battery technology field particularly, relates to a chargeable button cell.

Background

Rechargeable button batteries are small in size and are generally used for small electronic products such as Bluetooth earphones, hearing aids and electronic watches. The structure of the existing rechargeable button battery is that a containing cavity is formed between two metal half shells, and a battery cell is placed in the containing cavity. An insulating and sealing structure is arranged between the two metal half shells to avoid electrolyte leakage. The positive and negative electrode tabs of the battery cell are respectively welded with the two metal half shells so as to realize the electric connection between the battery cell and the shell. Receiving half shell size's of metal influence, the welding degree of difficulty of utmost point ear and half shell of metal is big, appears the not firm phenomenon of welded structure of utmost point ear easily, also destroys the casing easily during the welding, influences the production efficiency of battery.

For this reason, it is desirable to provide a rechargeable button cell that at least partially solves the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to solve above-mentioned problem at least partially, the utility model discloses a chargeable button cell, include:

a cathode cover including a cathode top wall and a cathode side wall extending downwardly from a periphery of the cathode top wall;

the positive electrode shell comprises a positive electrode bottom wall, and an accommodating cavity is formed between the positive electrode shell and the negative electrode cover;

the sealing ring is arranged between the negative electrode cover and the positive electrode shell;

a ferrule disposed within the receiving cavity and between the seal ring and the anode bottom wall;

the elastic check ring is positioned in the negative electrode cover; and

the battery cell is arranged in the accommodating cavity and comprises a negative electrode lug and a positive electrode lug;

the negative pole tab extends outwards from the top end of the battery cell along the radial direction of the battery cell to the axial outer side of the elastic check ring and is welded with the elastic check ring;

and the positive pole lug extends outwards from the bottom end of the battery cell to the bottom of the ferrule along the radial direction of the battery cell and is welded with the bottom.

According to the utility model discloses a chargeable button cell, through setting up circlip and lasso, weld negative pole utmost point ear and circlip, weld positive pole utmost point ear and lasso for welding operation goes on easily, can guarantee positive pole utmost point ear and negative pole utmost point ear welded fastness, it is more effective to make electric core and the electricity of anodal shell and negative pole lid be connected, and can not lead to the fact destruction to anodal shell and negative pole lid, can guarantee the intensity of anodal shell and negative pole lid, and then improve chargeable button cell's production efficiency.

Optionally, the positive electrode can further comprises a positive electrode side wall extending upwards from the periphery of the positive electrode bottom wall, and the positive electrode side wall comprises a concave part extending inwards in the radial direction of the rechargeable button cell so as to press the positive electrode side wall and the ferrule.

Optionally, the recess is welded to the ferrule.

Optionally, the negative electrode tab extends outwards from the top end of the battery cell along the radial direction of the battery cell to a position between the negative electrode top wall and the top wall of the elastic collar, and is welded with the top wall.

Optionally, the negative electrode tab extends outwards from the top end of the battery cell along the radial direction of the battery cell to a position between the battery cell and the bottom wall of the elastic collar, and is welded with the bottom wall.

Optionally, one end of the battery cell, which is located at the negative electrode tab, is provided with an installation portion which is recessed inwards along the radial direction of the battery cell, and the elastic check ring is arranged on the installation portion.

Optionally, the circlip is configured to have an elastic restoring force radially outward of the circlip, so that the circumferential side wall of the circlip abuts against the negative electrode side wall.

Optionally, the negative side wall is welded to the circumferential side wall of the circlip.

Optionally, the positive electrode side wall includes an inner bending portion, and the inner bending portion is disposed at an end of the positive electrode side wall away from the positive electrode bottom wall and is buckled and pressed to the circumferential outer side of the sealing ring.

Optionally, the negative pole lateral wall includes outer bending part, outer bending part set up in keeping away from of negative pole lateral wall the one end of negative pole roof, the sealing washer be provided with outer bending part matched with recess.

Drawings

The following drawings of the embodiments of the present invention are provided as a part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention.

In the drawings:

fig. 1 is a schematic structural view of a rechargeable button cell according to a preferred embodiment of the present invention;

fig. 2 is a schematic structural view of a rechargeable button cell according to another preferred embodiment of the present invention;

fig. 3 is a schematic structural view of a rechargeable button cell according to still another preferred embodiment of the present invention; and

fig. 4 is a schematic structural view of the elastic collar of the rechargeable button cell according to the present invention.

Description of reference numerals:

100: rechargeable button cell 110: negative electrode cover

111: negative electrode top wall 112: cathode side wall

113: outer bend 120: positive electrode shell

121: positive electrode bottom wall 122: side wall of positive electrode

123: the recessed portion 124: inner bend part

130: seal ring 131: groove

140: the battery cell 141: negative pole tab

142: positive electrode tab 143: mounting part

150: ferrule 160: elastic retainer ring

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.

In order to provide a thorough understanding of the present invention, a detailed description will be given below to illustrate the present invention. It is apparent that the practice of the invention is not limited to the specific details known to those skilled in the art. The present invention is described in detail below with reference to the preferred embodiments, however, the present invention can have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.

The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for clarity of description only and are not limiting.

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and do not limit the present invention.

Referring to fig. 1, a rechargeable button battery 100 according to a preferred embodiment of the present invention includes a negative electrode cap 110, a positive electrode can 120, and a battery cell 140. The negative cover 110 may be closed onto the positive can 120 to form a receiving cavity between the negative cover 110 and the positive can 120. The battery cell 140 can be disposed within the receiving cavity. The battery cell 140 may be made by winding a sequence group including a positive electrode plate, a separator, and a negative electrode plate. After winding, an adhesive tape can be attached to the circumferential outer surface of the battery cell 140 to prevent loosening. The battery cell 140 includes a negative electrode tab 141 electrically connectable to the negative electrode cover 110 and a positive electrode tab 142 electrically connectable to the positive electrode case 120.

It should be noted that the directional terms used in the present invention, such as "upper", "lower", "upward", "downward", "top", "bottom", etc., are based on the rechargeable button cell 100 placed upright.

Specifically, the negative electrode cover 110 includes a negative electrode top wall 111 and a negative electrode side wall 112 extending downward from the periphery of the negative electrode top wall 111, and a bottom end of the negative electrode side wall 112 may enclose a bottom opening. The positive electrode can 120 includes a positive electrode bottom wall 121 and a positive electrode side wall 122 extending upward from a periphery of the positive electrode bottom wall 121, and a top end of the positive electrode side wall 122 may enclose a top opening. The cell 140 can enter the positive housing 120 from the top opening. The negative side wall 112 can enter the positive can 120 from the top opening and connect to the inside of the positive side wall 122, thereby forming a receiving cavity between the bottom opening and the top opening. In the assembly process of the rechargeable button cell 100 of the present embodiment, the battery cell 140 is first placed in the positive casing 120 from the top opening, and then the negative electrode sidewall 112 is inserted into the positive casing 120 from the top opening, so as to cover the negative electrode cover 110 to the positive casing 120. The negative electrode cover 110 and the positive electrode can 120 may be made of a metal material, for example, a stainless steel material such as 304 or 316L.

In order to ensure the sealing effect of the accommodating cavity and avoid the electrolyte in the accommodating cavity from overflowing, a sealing ring 130 is further arranged between the negative electrode cover 110 and the positive electrode shell 120. The sealing ring 130 is made of a non-conductive material, such as plastic or the like.

Specifically, the cathode side wall 112 includes an outer bent portion 113, and the outer bent portion 113 is disposed at an end of the cathode side wall 112 away from the cathode top wall 111, that is, a bottom end of the cathode side wall 112. The sealing ring 130 is provided with a groove 131 which cooperates with the outer fold 113. In the assembly process of the rechargeable button battery 100 of the present embodiment, the sealing ring 130 may be embedded in the negative electrode cover 110 by an embedding device to form a negative electrode cover assembly embedded with the sealing ring 130. The negative cap assembly is then closed onto the positive can 120 with the circumferential outer side of the sealing ring 130 engaging the positive sidewall 122 to seal the receiving cavity.

In order to make the arrangement of the sealing ring 130 more stable and reliable, an inner bending portion 124 is disposed at an end of the positive electrode side wall 122 away from the positive electrode bottom wall 121, that is, at a top end of the positive electrode side wall 122, and the inner bending portion 124 can be buckled to a circumferential outer side of the sealing ring 130 to press the sealing ring 130. That is, after the negative cap assembly is covered on the positive casing 120, the top end of the positive sidewall 122 may be bent inward, so that the sealing ring 130 is tightly attached to the positive sidewall 122.

Further, the rechargeable button cell 100 further includes a collar 150, the collar 150 is made of a metal material, and the positive tab 142 can be conveniently and electrically connected to the positive can 120 through the collar 150. Specifically, the collar 150 is disposed within the receiving cavity and between the seal ring 130 and the cathode bottom wall 121. The positive tab 142 extends from the bottom end of the battery cell 140, extends outward in the radial direction of the battery cell 140 to the bottom of the collar 150, and is welded to the bottom of the collar 150.

In the assembly process of the rechargeable button cell 100 of the present embodiment, the collar 150 may be sleeved on one end of the battery cell 140 having the positive tab 142 in advance, and then the positive tab 142 is welded to the bottom of the collar 150. The welding mode can adopt resistance welding, laser welding or ultrasonic welding and the like. That is, the welding of the positive tab 142 can be completed before the battery cell 140 is placed into the positive casing 120. When welding, operating space is great for welding operation goes on easily, can guarantee anodal utmost point ear 142 welded fastness. After the positive tab 142 is welded to the bottom of the collar 150, the cell 140 with the collar 150 can be inserted into the positive casing 120. After the rechargeable button battery 100 is assembled, the collar 150 is located between the sealing ring 130 and the positive electrode bottom wall 121, and under the pressure of the sealing ring 130, the collar 150 is closely matched with the positive electrode bottom wall 121, so that the positive electrode tab 142 can be effectively electrically connected with the positive electrode shell 120.

In addition, the collar 150 can also support the sealing ring 130, especially during the inward bending operation of the top end of the positive electrode sidewall 122 to make the sealing ring 130 tightly fit with the positive electrode sidewall 122.

In order to further ensure that the positive tab 142 is electrically connected to the positive casing 120 through the collar 150, a recess 123 recessed inward in the radial direction of the rechargeable button cell 100 may be further disposed on the positive sidewall 122 to compress the positive sidewall 122 and the collar 150. The recess 123 is formed by pressing, i.e., pressing from the outside of the positive electrode sidewall 122 after the rechargeable button cell 100 is assembled. Any suitable extrusion process may be selected, such as a wire binding process. This provides a seal at the recess 123, which both ensures that the ferrule 150 is in sufficient contact with the positive can 120 and enhances the sealing effect.

Of course, in order to ensure that the collar 150 and the positive electrode can 120 are more sufficiently contacted, the recess 123 and the collar 150 may be welded by laser welding, ultrasonic welding, or the like. The number of welds in a particular weld location may be determined as desired. For example, welding may be performed at the deepest part of the recess 123.

Further, the rechargeable button cell 100 further includes a circlip 160, the circlip 160 is made of a metal material, and the negative tab 141 can be conveniently and electrically connected to the negative cover 110 through the circlip 160.

Specifically, the circlip 160 is located within the negative electrode cover 110. The negative tab 141 extends from the top end of the battery cell 140, extends outward in the radial direction of the battery cell 140 to the axial outside of the elastic collar 160, and is welded to the elastic collar 160. In the illustrated embodiment, the negative tab 141 extends from the top end of the cell 140 radially outward of the cell 140 to between the negative top wall 111 and the top wall of the circlip 160, and is welded to the top wall of the circlip 160. Of course, the negative tab 141 may also extend outward from the top end of the battery cell 140 in the radial direction of the battery cell 140 to between the battery cell 140 and the bottom wall of the elastic collar 160, and be welded with the bottom wall of the elastic collar 160.

In the assembly process of the rechargeable button battery 100 of the present embodiment, the elastic collar 160 may be placed on one end of the battery cell 140 having the negative tab 141 in advance, and then the negative tab 141 is welded to the top wall of the elastic collar 160. The welding mode can adopt resistance welding, laser welding or ultrasonic welding and the like. During welding, the operation space is large, so that the welding operation is easy to perform, and the welding firmness of the negative electrode tab 141 can be ensured. After the negative electrode tab 141 is welded to the top wall of the elastic check ring 160, the elastic check ring 160 is pressed into the negative electrode cover 110, the elastic check ring 160 is tightly attached to the negative electrode top wall 111, and effective electric connection between the negative electrode tab 141 and the negative electrode cover 110 can be achieved.

The circlip 160 may be configured to have an elastic restoring force radially outward of the circlip 160, and after the circlip 160 is pressed into the negative electrode cover 110, the circumferential side wall of the circlip 160 can abut against the negative electrode side wall 112 to further ensure effective electrical connection of the negative electrode tab 141 and the negative electrode cover 110 body.

Referring specifically to fig. 4, the circlip 160 may be configured as a metal ring having a notch, and the outer diameter of the circlip 160 is designed to be slightly larger than the inner diameter of the negative electrode cover 110. The elastic stopper 160 is inserted into the negative electrode cap 110 after being radially compressed, and the elastic stopper 160 has an elastic restoring force radially outward. Under the action of the elastic restoring force, the circumferential side wall of the elastic retainer ring 160 can abut against the negative side wall 112.

Of course, in order to ensure that the circlip 160 and the negative electrode cover 110 are in more sufficient contact, the negative electrode side wall 112 and the circumferential side wall of the circlip 160 may be welded by laser welding, ultrasonic welding, or the like. The number of welds in a particular weld location may be determined as desired.

The assembly process of the rechargeable button cell 100 of the present embodiment is as follows:

the ferrule 150 is sleeved on one end of the battery cell 140 having the positive electrode tab 142, and then the positive electrode tab 142 is welded to the bottom of the ferrule 150. After the positive tab 142 is welded, the cell 140 with the collar 150 is inserted into the positive casing 120. Next, the circlip 160 is placed on the end of the cell 140 having the negative tab 141, that is, the circlip 160 is placed on the top end of the cell 140, and then the negative tab 141 is welded to the top wall of the circlip 160. Next, the negative electrode cover 110 with the gasket 130 fitted thereto is inserted into the positive electrode can 120, and the negative electrode cover 110 is fitted to the positive electrode can 120. The circlip 160 is also pressed into the negative electrode cap 110 during the insertion of the negative electrode cap 110, into which the gasket 130 is previously fitted, into the positive electrode can 120. Finally, the positive electrode side wall 122 is pressed by a wire binding process to form a concave portion 123, and the concave portion 123 and the abutting portion of the elastic retainer ring 160 and the negative electrode can are welded to complete the assembly.

Referring to fig. 2 schematically showing a rechargeable button cell 200 according to a second preferred embodiment of the present invention, the difference from the rechargeable button cell 100 of the first embodiment is that one end of the battery cell 140 located at the negative electrode tab 141 is provided with a mounting portion 143 recessed inward in the radial direction of the battery cell 140, and the elastic collar 160 is provided on the mounting portion 143. The mounting portion 143 can play a fixed role in the circlip 160, which is beneficial to welding the negative electrode tab 141 to the top wall of the circlip 160, and can improve the assembly efficiency of the rechargeable button cell.

The assembly process of the rechargeable button cell 200 of the present embodiment is substantially the same as that of the rechargeable button cell 100 of the first embodiment, except that the elastic collar 160 is first placed in the mounting portion 143 of the battery cell 140 during the process of welding the negative electrode tab 141 to the top wall of the elastic collar 160.

Referring to fig. 3, which schematically shows a rechargeable button cell 300 according to a third preferred embodiment of the present invention, the difference from the rechargeable button cell 200 of the second embodiment is that a negative tab 141 extends outward from the top end of the electric core 140 along the radial direction of the electric core 140 to between the electric core 140 and the bottom wall of the elastic collar 160, and is welded with the bottom wall.

The assembly process of the rechargeable button cell 300 of the present embodiment is substantially the same as that of the rechargeable button cell 200 of the second embodiment, except that the negative electrode tab 141 is welded to the bottom wall of the circlip 160.

According to the utility model discloses a chargeable button cell, through setting up circlip 160 and lasso 150, weld negative pole utmost point ear 141 and circlip 160, weld positive pole utmost point ear 142 and lasso 150, make the welding operation go on easily, can guarantee positive pole utmost point ear 142 and negative pole utmost point ear 141 welded fastness, it is more effective to make electric core 140 and negative pole lid 110 and the electricity of positive shell 120 be connected, and can not lead to the fact destruction to positive shell 120 and negative pole lid 110, can guarantee the intensity of positive shell 120 and negative pole lid 110, and then improve chargeable button cell's production efficiency.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.

Claims

1. A rechargeable button cell, comprising:

the elastic check ring is positioned in the negative electrode cover; and

2. The rechargeable button cell of claim 1, wherein the positive casing further comprises a positive sidewall extending upward from a peripheral edge of the positive bottom wall, the positive sidewall comprising a recess extending radially inward of the rechargeable button cell to compress the positive sidewall and the collar.

3. The rechargeable button cell according to claim 2, wherein the recess is welded to the collar.

4. The rechargeable button cell of claim 1, wherein the negative tab extends from the top end of the cell radially outward of the cell to between the negative top wall and the top wall of the circlip and is welded to the top wall.

5. The rechargeable button cell of claim 1, wherein the negative tab extends from the top end of the cell radially outward of the cell to between the cell and the bottom wall of the circlip and is welded to the bottom wall.

6. The rechargeable button cell according to claim 1, wherein one end of the cell, which is located at the negative electrode tab, is provided with a mounting portion which is recessed inwards in a radial direction of the cell, and the elastic check ring is arranged on the mounting portion.

7. The rechargeable button cell according to claim 1, wherein the circlip is configured to have a resilient restoring force radially outward of the circlip, causing the circumferential side wall of the circlip to abut against the negative side wall.

8. The rechargeable button cell according to claim 7, wherein the negative side wall is welded to the circumferential side wall of the circlip.

9. The rechargeable button cell according to claim 2, wherein the positive electrode side wall comprises an inner bent portion, and the inner bent portion is disposed at one end of the positive electrode side wall away from the positive electrode bottom wall and is buckled to the circumferential outer side of the sealing ring.

10. The rechargeable button cell according to claim 1, wherein the negative side wall comprises an outer bent portion, the outer bent portion is disposed at an end of the negative side wall away from the top wall of the negative electrode, and the sealing ring is provided with a groove matched with the outer bent portion.